Discussion on influence factors of magnetic measurement deviation of electrical steel by Epstein frame
The measurement of electrical steel magnetic property by Epstein frame was usually affected by the factors of equipment status,sample preparation and measurement process,which were studied in laboratory.The results showed that using standard samples to verify the status of the equipment was not sufficient,and verification and calibration program of the key components of the magnetic device should be established to ensure the equipment accuracy in laboratory.At the same time,different sample processing ways could lead to large differences in the appearance of specimen profile,so the thickness of the sample cut-off area should not be lower than 60 ％ of the specimen thickness.In addition,an agreed density should be used for measurement,and the sample temperature could not exceed 50 ℃ owing to the impact of magnetization.
NETL
NSTL
万方数据
维普
